Two cases of malignant fibrous histiocytoma of maxillary sinus.

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Case 1. A 34-year-old male complained of pain and numbness of the left cheek. CT scan revealed a left maxillary sinus tumor which had destroyed the medial, posterior and lateral walls. The histopathological diagnosis was malignant fibrous histiocytoma (common type). Case 2. A 74-year-old female suffered from left dental and cheek pain. CT scan revealed a tumor mass which had destroyed the anterior, lateral and posterior walls and invaded pterygomaxillary fossa. The histopathological diagnosis was malignant fibrous histiocytoma (Giant cell type). Both patients were treated with radiation therpy, chemotherapy and surgery. Case 1 remains free of disease 4 year after surgery. Case 2 died of local recurrence and systemic matastasis 2 months the after surgery.Clinical stage of case 2 was more advanced than that of case 1. Giant cell type of malignant fibrous histiocytoma is more malignant than the common type. The early death of case 2 was presumably due to the more malignant histopathological type.